No Serial Ports Found Bitminter

When you connect devices to a computer using COM physical ports or USB ports (depending on the device connected) they get a COM port number assigned that you can see in your device manager, under “Ports” section. The thing you should keep in mind is that under this section you can only see the ports that are currently in use. I won’t get into more details than needed like the devices that you can connect because this is not the purpose of this article. This and many more things regarding COM/USB/LPT ports will be covered in a future article in here but for now you can search the web for these terms and find out more about them. What I will try to explain and I hope it will be of help for those of you that have this issue is how to re-activate or make COM ports available although they seem to be unusable. If you are using some terminal emulator like putty or even emulators for networked ports like chances are you have this issue and you can’t use a specific COM port that your application or software wants, due to the fact that it is not available in the list for the use/map/link of ports.

Re: javax.comm - No serial ports found! 843797 Sep 27, 2001 5:43 PM ( in response to 843797 ) Try javax.comm.properties into c: jdk1.3.1_01 jre lib. The serial port is through the USB on the Arduino. The serial port driver may have been corrupted or deleted and need to be reinstalled or the Arduino board itself has an issue.

It will probably lack from the list and if by whatever reason you do find it and try to change the default assigned COM ports, you will get a different error (depending on the software you are using) that the port is protected by the operating system, or that the port is locked or protected. You can see all COM ports IN USE at current time in your device manager, like in the next picture: In the above picture, COM1 is the available (in use) physical port of my workstation.

I could add some screens with errors you can get from different software that you can use to administer or interface with these ports but some were already mentioned and the rest are too many and irrelevant to the subject. What you need to know and the general idea behind all this subject is that Windows assigns a port number each time you plug in a device, like a printer for example. If you remove it and plug it in again, the old port number might be left behind, not being deleted and the same device might get a different port number assigned to it each time and so on. Now imagine some of the software and applications you will be using to interface with these ports only recognize and can use a certain number of ports. This certain and maximum ports number for a few of these applications is 9. What you have to do is to clear or remove those old assigned ports and not in use anymore from system history. But as we already know you can only see those that are in use.

I will show you how to make them visible in device manager in order to uninstall/clear them. SOLUTION to Make COM Ports available: 1.

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Go to Start – Run and type in “devmgmt.msc” without the quotes and press Enter from your keyboard or in the same Run dialogue use “compmgmt.msc” without the quotes and press Enter and navigate to “Device Manager” by left clicking on it to select it. Now if you expand the “Ports” section from device manager you can see the available ports as in my print screen. The first two steps above were more to see the “in use” ports in case you didn’t do that already. Now to continue, go once again to Start – Run and type in “sysdm.cpl” without the quotes and press Enter from your keyboard. Navigate to “advanced” tab and then select the “Environment Variables” button: 4.